Colorful and chaotic stacked hotel in North Holland.

This cheese shop also houses a museum devoted to Dutch dairy.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's only museum devoted to the wonders of fluorescence.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

This striking sculpture of Icarus honors Greece's fallen flyers.

Where commuters walk through remnants of an ancient Greek necropolis.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Notorious artist squat renovated into legal studios.

This bridge was constructed from the rubble of the infamous Bastille.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

Former hunting lodge of a duke who was an avid collector of impressionist works.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

Claude Monet was baptized in this lavishly ornate Paris church.